The Aqara U400 is the first smart lock that combines Apple Home Key support with UWB (Ultra-Wideband), a wireless tech that helps your phone determine its location relative to nearby devices. It’s currently on sale during Amazon’s Big Spring Sale, making it a great time for iPhone users looking to upgrade to a hands-free door lock.
What Makes the Aqara U400 Different
Unlike most smart locks that require you to pull out your phone, open an app, or tap your device against a reader, the U400 simplifies the process. With Apple’s U1 UWB chip, your iPhone detects when you’re nearby and unlocks the door automatically. No tapping, no fumbling, and no app needed.
Imagine the difference between swiping a hotel key card and having a car that unlocks as you approach. The U400 is that convenient for your front door.
Additionally, it supports Apple Home Key, which stores a digital key in your iPhone’s Wallet app—the same place where you keep boarding passes and credit cards. This lets you use Face ID or Touch ID to unlock, or even share a digital key with a family member without having to copy a physical spare.
The Sale Details
The Verge reports that the Aqara U400 is discounted during Amazon’s Big Spring Sale, which is happening right now. This sale includes a variety of tech categories, from robot vacuums to streaming devices, but smart home products like the U400 are especially appealing for Apple users.
The U400 is a deadbolt replacement, so you’ll need to swap out the lock hardware on your existing door. Most people can complete this task with a screwdriver in about 20 minutes.
| By The Numbers: Amazon | |
|---|---|
| Stock Price | $200.95 (+0.81%) |
| Ticker | AMZN |
| CEO | Andy Jassy |
| Headquarters | Seattle, WA |
| Founded | 1994 |
| Sector | Big Tech |
What This Means for Everyday Users
If you’re an iPhone user who often juggles groceries, a stroller, or other items at your front door, the U400 is a game changer. The hands-free unlock activates as you approach, so by the time you reach the door, it’s already open.
Plus, Apple Home Key integration means you won’t rely on a third-party app or a company’s cloud servers. The key is stored on your device, making it more dependable than locks that need a constant internet connection.
However, Android users won’t enjoy the same experience. The U400’s hands-free UWB feature only works within Apple’s ecosystem. If your household has a mix of iPhone and Android users, some members will still have to use a code or the companion app.
Other Big Spring Sale Highlights
The U400 isn’t the only deal worth checking out this week. Amazon’s Big Spring Sale also features discounts on the Fire TV Stick 4K Max, which Wired calls a must-have for Prime Video users at nearly half off. Additionally, Apple’s latest MacBook Pro models with M5 Pro and M5 Max chips are up to $200 off at Amazon, according to Mashable. This is significant since new Apple hardware doesn’t usually see discounts so soon after launch.
First-generation AirPods Max are back to their lowest price ever at $399 on Woot (an Amazon-owned deals site), according to Mashable, perfect for those who missed earlier sales on these headphones.
Community Reactions
“The hands-free unlock with UWB is genuinely the feature I didn’t know I needed until I used it. Coming home with bags of groceries is a completely different experience.”
“Finally a lock that works like a car — walk up, unlock. Everything else feels like a step backward now.”
Further Reading
- The Verge: Aqara U400 deal during Amazon’s Big Spring Sale
- The Verge: Best spring cleaning deals from Amazon’s Big Spring Sale
- Wired: Fire TV Stick 4K Max is almost half off
What To Watch
Amazon’s Big Spring Sale is a limited-time event, so prices on the U400 and other highlighted deals are likely to go back up once the sale ends. If you’re considering this deal, it’s smart to check the page sooner rather than later.
On the broader smart lock front, keep an eye out for other manufacturers to introduce their own UWB-enabled locks. With Apple’s Home Key gaining popularity, the U400 being the first to combine it with UWB means competitors are probably developing similar products. We could see more options at lower prices by late 2026.
